Serpophaga hypoleuca
Silhouette: Emily Willoughby · PhyloPic
In 3 days <5%
The river tyrannulet (Serpophaga hypoleuca) is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela. The river tyrannulet is 10.5 to 12.5 cm (4.1 to 4.9 in) long and weighs 5.5 to 6.7 g (0.19 to 0.24 oz). The sexes have the same plumage. Adults of the nominate subspecies have a gray forehead and a black crown with white central feathers that are usually hidden; the black extends as a flat crest. They have white lores, a white partial eye-ring, and a black line through the eye on an otherwise white face. Their upperparts are brownish gray. Their wings are dusky brownish gray and their tail long and dusky. Their chin, throat, and underparts are white with a pale gray tinge across the breast. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yasuní National Park | 🇪🇨 Ecuador | |
| 2 | Manu National Park | 🇵🇪 Peru |
Rare
Under 5% of wildlife watchers report a River Tyrannulet sighting in Yasuní National Park on a given day, based on 20 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 465th most-seen of the 533 birds we can rate there. Over three days the chance rises to under 5%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a River Tyrannulet in Yasuní National Park on a given day, so our monthly data shows no clear season.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most River Tyrannulet sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate River Tyrannulet sightings, Yasuní National Park has the highest daily chance: under 5%. Next come Manu National Park (Peru, under 5%).
Same family: Tyrannidae
The closest relatives of the River Tyrannulet that you can see in Yasuní National Park (family Tyrannidae, Tyrant Flycatchers) are Tropical Kingbird (about 50%), Great Kiskadee (about 50%) and Lesser Kiskadee (about 40%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the River Tyrannulet is recorded against all the birds logged in Yasuní National Park (20 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
